main-window,new-call-box: Move origin store from MainWindow to NewCallBox

The main window has no need to store origins now so this simplifies
things dramatically.

src/calls-new-call-box.h

@@ -25,6 +25,8 @@
 #ifndef CALLS_NEW_CALL_BOX_H__
 #define CALLS_NEW_CALL_BOX_H__
 
+#include "calls-provider.h"
+
 #include <gtk/gtk.h>
 
 G_BEGIN_DECLS
@@ -33,6 +35,8 @@ G_BEGIN_DECLS
 
 G_DECLARE_FINAL_TYPE (CallsNewCallBox, calls_new_call_box, CALLS, NEW_CALL_BOX, GtkBox);
 
+CallsNewCallBox * calls_new_call_box_new (CallsProvider *provider);
+
 G_END_DECLS
 
 #endif /* CALLS_NEW_CALL_BOX_H__ */